Accuracy of inclinometer functions of the activPAL and ActiGraph GT3X+: A focus on physical activity.

The purpose of the study was to examine the accuracy of inclinometer functions of the ActiGraph GT3X+ (AG) (worn on the waist and wrist) and the activPAL (AP) in assessing time spent sitting, standing, and stepping. A total of 62 adults (age: 18-40 yrs; male:37; female:25) wore three activity monitors (AG waist, and AG wrist, and AP) while completing 15 different types of activities. The 15 activities were classified into 3 different postures (sitting, standing, and stepping) based on the directly observed behaviors. Minutes estimated from the inclinometers of the three monitors were directly compared to those from direct observation (criterion method) using mean absolute percent error (MAPE) values, effect sizes (Cohen's D), and equivalence testing. The AP was more accurate than the both waist- and wrist-worn AG in both sitting and standing activities, but the AG was more accurate than the AP in stepping activity when the stepping activity was determined with 0.7 step/s threshold. Equivalence testing indicated that the time measured by the waist-, wrist-worn AG, and AP showed significant equivalence to the time in the equivalence zone (90% confidence interval: 2.7 to 3.3min) for 6, 5, and 7 activities, respectively. The AP was reasonably accurate for detecting sitting, standing, and stepping, and the AG was very accurate for classifying stepping when the stepping activity was determined by the formula created by 0.7 step/s threshold. It is expected that the result of the study would contribute to performing movement pattern analyses and health promotion research for classifying activities.

An HS ，Kim Y ，Lee JM 《-》

Ability of thigh-worn ActiGraph and activPAL monitors to classify posture and motion.

Steeves JA ，Bowles HR ，McClain JJ ，Dodd KW ，Brychta RJ ，Wang J ，Chen KY ... -  《-》

Criterion validity of the activPAL™ and ActiGraph for assessing children's sitting and standing time in a school classroom setting.

Ridley K ，Ridgers ND ，Salmon J 《International Journal of Behavioral Nutrition and Physical Activity》

Accuracy of Posture Allocation Algorithms for Thigh- and Waist-Worn Accelerometers.

Edwardson CL ，Rowlands AV ，Bunnewell S ，Sanders J ，Esliger DW ，Gorely T ，O'Connell S ，Davies MJ ，Khunti K ，Yates T ... -  《-》

Criterion validity of the ActiGraph and activPAL in classifying posture and motion in office-based workers: A cross-sectional laboratory study.

Radtke T ，Rodriguez M ，Braun J ，Dressel H ... -  《PLoS One》